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Messages - Old Radio Bloke

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HF Mystery Signals / Re: UNID ~10,600 – 12,400 kHz
« on: February 11, 2020, 2318 UTC »
Did you ever find out anymore about this transmission? Just listening to the audio, it sounds similar to ROS mode used by hams (and some CBers etc.). This was developed 10+ years ago (?) and is now quite obscure in the ham world. Though, can't be normal ROS if the transmission is constant (ham ROS transmission would be more like 1 or 2 minutes long) and it would never be anything like 1.8MHz bandwidth! Also, nearest ham ROS frequency is 10130KHz. Certainly sounds similar though - like ROS but over greater bandwidth. I believe ROS mode uses a combination of several commercial techniques to allow simultaneous transmissions over spread spectrum. I have seen/heard "ROS type" transmissions similar to yours over which seem to exceed the standard 2250Hz bandwidth that hams use.
More info on ROS here: https://www.sigidwiki.com/wiki/ROS

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